Another attempt at fixing the test

Tapeti.Tests/Tapeti.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
@@ -9,12 +9,6 @@
     <NoWarn>1701;1702</NoWarn>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Compile Remove="Core\**" />
-    <EmbeddedResource Remove="Core\**" />
-    <None Remove="Core\**" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="6.8.0" />
     <PackageReference Include="JetBrains.Annotations" Version="2022.3.1" />

appveyor.yml

@@ -32,10 +32,6 @@ build:
   project: Tapeti.sln
 
 test:
-  assemblies:
-    only:
-      - Tapeti.Tests\bin\Release\net6.0\Tapeti.Tests.dll
-      - Tapeti.Tests\bin\Release\net7.0\Tapeti.Tests.dll
   categories:
     except:
       - Requires Docker